Drawing Circles with the VE API
https://virtualearth.spaces.live.com/Blog/cns!2BBC66E99FDCDB98!7927.entry
This is a question I have been asked a few times about about the VE v4 Map Control. Now there's a simpler way to do it than writing your own logic using a polygon or polyline (i.e. borrowing someone else's logic:))!
-Marc